The choice of insulating material in terms of thermal performance involves studying two factors: thermal resistance R and the thickness of the insulating material.

  • Thermal resistance (R)
To evaluate the thermal insulation of a material, it is necessary to know its resistance to heat flow (m2.K/W) presented by a material in a given thickness. The higher the thermal resistance R, the better insulation is provided by the material.
  • Thermal conductivity (λ )
Thermal conductivity or λ is the quantity of heat W/m.K that may be transferred into a material, at a given time. The lower the λ value, the 
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